/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 22652
 * Date: 2024-04-01
 * Time: 22:33
 */
class Counter {
    public int count = 0;
    private Object locker = new Object();

    public void increase() {
        synchronized (this) {
            count++;

        }
    }
}

//每个线程循环 1w 次，累加变量 count 的值，count 默认值为 0，注意线程安全问题。
public class test_3 {
    public static int num =0;
    public void increase(){
        num++;
    }
    public static void main(String[] args) throws InterruptedException {
        Counter counter =new Counter();
        Thread t1=new Thread(()->{
            for (int i = 0; i <5000 ; i++) {
                counter.increase();
            }

        });
        Thread t2=new Thread(()->{
                for (int i = 0; i <5000 ; i++) {
                    counter.increase();
                }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.count);
    }
}
